add a wrapper for cross compilers, which makes the correct link to the cross compiler. Only works for "gcc", haven't tried for g++ and the others

svn path=/nixpkgs/trunk/; revision=4317
This commit is contained in:
Armijn Hemel 2005-11-29 01:40:33 +00:00
parent 0cf7a93827
commit 508cd3a3e8
7 changed files with 447 additions and 0 deletions

View File

@ -0,0 +1,5 @@
export NIX_CFLAGS_COMPILE="@cflagsCompile@ $NIX_CFLAGS_COMPILE"
export NIX_CFLAGS_LINK="@cflagsLink@ $NIX_CFLAGS_LINK"
export NIX_LDFLAGS="@ldflags@ $NIX_LDFLAGS"
export NIX_LDFLAGS_BEFORE="@ldflagsBefore@ $NIX_LDFLAGS_BEFORE"
export NIX_GLIBC_FLAGS_SET=1

View File

@ -0,0 +1,94 @@
. $stdenv/setup
. $substitute
# Force gcc to use ld-wrapper.sh when calling ld.
cflagsCompile="-B$out/bin/"
if test -z "$nativeGlibc"; then
# The "-B$glibc/lib/" flag is a quick hack to force gcc to link
# against the crt1.o from our own glibc, rather than the one in
# /usr/lib. The real solution is of course to prevent those paths
# from being used by gcc in the first place.
# The dynamic linker is passed in `ldflagsBefore' to allow
# explicit overrides of the dynamic linker by callers to gcc/ld
# (the *last* value counts, so ours should come first).
cflagsCompile="$cflagsCompile -B$glibc/lib/ -isystem $glibc/include"
ldflags="$ldflags -L$glibc/lib"
ldflagsBefore="-dynamic-linker $glibc/lib/ld-linux.so.2"
fi
if test -n "$nativeTools"; then
gccPath="$nativePrefix/bin"
ldPath="$nativePrefix/bin"
else
ldflags="$ldflags -L$gcc/lib"
gccPath="$gcc/bin"
ldPath="$binutils/bin"
fi
mkdir $out
mkdir $out/bin
mkdir $out/nix-support
doSubstitute() {
local src=$1
local dst=$2
substitute "$src" "$dst" \
--subst-var "out" \
--subst-var "shell" \
--subst-var "gcc" \
--subst-var "gccProg" \
--subst-var "binutils" \
--subst-var "glibc" \
--subst-var "cflagsCompile" \
--subst-var "cflagsLink" \
--subst-var "ldflags" \
--subst-var "ldflagsBefore" \
--subst-var-by "ld" "$ldPath/ld"
}
# Make wrapper scripts around gcc, g++, and g77. Also make symlinks
# cc, c++, and f77.
mkGccWrapper() {
local dst=$1
local src=$2
if ! test -f "$src"; then
echo "$src does not exist (skipping)"
return
fi
gccProg="$src"
doSubstitute "$gccWrapper" "$dst"
chmod +x "$dst"
}
mkGccWrapper $out/bin/$cross-gcc $gccPath/$cross-gcc
#ln -s gcc $out/bin/cc
mkGccWrapper $out/bin/g++ $gccPath/g++
ln -s g++ $out/bin/c++
mkGccWrapper $out/bin/g77 $gccPath/g77
ln -s g77 $out/bin/f77
# Make a wrapper around the linker.
doSubstitute "$ldWrapper" "$out/bin/ld"
chmod +x "$out/bin/ld"
# Emit a setup hook. Also store the path to the original GCC and
# Glibc.
test -n "$gcc" && echo $gcc > $out/nix-support/orig-gcc
test -n "$glibc" && echo $glibc > $out/nix-support/orig-glibc
doSubstitute "$addFlags" "$out/nix-support/add-flags"
doSubstitute "$setupHook" "$out/nix-support/setup-hook"
cp -p $utils $out/nix-support/utils

View File

@ -0,0 +1,30 @@
# The Nix `gcc' stdenv.mkDerivation is not directly usable, since it doesn't
# know where the C library and standard header files are. Therefore
# the compiler produced by that package cannot be installed directly
# in a user environment and used from the command line. This
# stdenv.mkDerivation provides a wrapper that sets up the right environment
# variables so that the compiler and the linker just "work".
{ name ? "", stdenv, nativeTools, nativeGlibc, nativePrefix ? ""
, gcc ? null, glibc ? null, binutils ? null, shell ? "", cross ? ""
}:
assert nativeTools -> nativePrefix != "";
assert !nativeTools -> gcc != null && binutils != null;
assert !nativeGlibc -> glibc != null;
stdenv.mkDerivation {
builder = ./builder.sh;
substitute = ../substitute/substitute.sh;
setupHook = ./setup-hook.sh;
gccWrapper = ./gcc-wrapper.sh;
ldWrapper = ./ld-wrapper.sh;
utils = ./utils.sh;
addFlags = ./add-flags;
inherit nativeTools nativeGlibc nativePrefix gcc glibc binutils cross;
name = if name == "" then gcc.name else name;
langC = if nativeTools then true else gcc.langC;
langCC = if nativeTools then true else gcc.langCC;
langF77 = if nativeTools then false else gcc.langF77;
shell = if shell == "" then stdenv.shell else shell;
}

View File

@ -0,0 +1,125 @@
#! @shell@ -e
if test -n "$NIX_GCC_WRAPPER_START_HOOK"; then
. "$NIX_GCC_WRAPPER_START_HOOK"
fi
if test -z "$NIX_GLIBC_FLAGS_SET"; then
. @out@/nix-support/add-flags
fi
. @out@/nix-support/utils
# Figure out if linker flags should be passed. GCC prints annoying
# warnings when they are not needed.
dontLink=0
if test "$*" = "-v" -o -z "$*"; then
dontLink=1
else
for i in "$@"; do
if test "$i" = "-c"; then
dontLink=1
elif test "$i" = "-S"; then
dontLink=1
elif test "$i" = "-E"; then
dontLink=1
elif test "$i" = "-E"; then
dontLink=1
elif test "$i" = "-M"; then
dontLink=1
elif test "$i" = "-MM"; then
dontLink=1
fi
done
fi
# Optionally filter out paths not refering to the store.
params=("$@")
if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
rest=()
n=0
while test $n -lt ${#params[*]}; do
p=${params[n]}
p2=${params[$((n+1))]}
if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
skip $p
elif test "$p" = "-L" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "${p:0:3}" = "-I/" && badPath "${p:2}"; then
skip $p
elif test "$p" = "-I" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "$p" = "-isystem" && badPath "$p2"; then
n=$((n + 1)); skip $p2
else
rest=("${rest[@]}" "$p")
fi
n=$((n + 1))
done
params=("${rest[@]}")
fi
# Add the flags for the C compiler proper.
extraAfter=($NIX_CFLAGS_COMPILE)
extraBefore=()
if test "$dontLink" != "1"; then
# Add the flags that should only be passed to the compiler when
# linking.
extraAfter=(${extraAfter[@]} $NIX_CFLAGS_LINK)
# Add the flags that should be passed to the linker (and prevent
# `ld-wrapper' from adding NIX_LDFLAGS again).
for i in $NIX_LDFLAGS_BEFORE; do
extraBefore=(${extraBefore[@]} "-Wl,$i")
done
for i in $NIX_LDFLAGS; do
if test "${i:0:3}" = "-L/"; then
extraAfter=(${extraAfter[@]} "$i")
else
extraAfter=(${extraAfter[@]} "-Wl,$i")
fi
done
export NIX_LDFLAGS_SET=1
if test "$NIX_STRIP_DEBUG" = "1"; then
# Add executable-stripping flags.
extraAfter=(${extraAfter[@]} $NIX_CFLAGS_STRIP)
fi
fi
# Optionally print debug info.
if test "$NIX_DEBUG" = "1"; then
echo "original flags to @gccProg@:" >&2
for i in "${params[@]}"; do
echo " $i" >&2
done
echo "extraBefore flags to @gccProg@:" >&2
for i in ${extraBefore[@]}; do
echo " $i" >&2
done
echo "extraAfter flags to @gccProg@:" >&2
for i in ${extraAfter[@]}; do
echo " $i" >&2
done
fi
if test -n "$NIX_GCC_WRAPPER_EXEC_HOOK"; then
. "$NIX_GCC_WRAPPER_EXEC_HOOK"
fi
# Call the real `gcc'. Filter out warnings from stderr about unused
# `-B' flags, since they confuse some programs. Deep bash magic to
# apply grep to stderr (by swapping stdin/stderr twice).
if test -z "$NIX_GCC_NEEDS_GREP"; then
@gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
else
(@gccProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]} 3>&2 2>&1 1>&3- \
| (grep -v 'file path prefix' || true); exit ${PIPESTATUS[0]}) 3>&2 2>&1 1>&3-
exit $?
fi

View File

@ -0,0 +1,145 @@
#! @shell@ -e
if test -n "$NIX_LD_WRAPPER_START_HOOK"; then
. "$NIX_LD_WRAPPER_START_HOOK"
fi
if test -z "$NIX_GLIBC_FLAGS_SET"; then
. @out@/nix-support/add-flags
fi
. @out@/nix-support/utils
# Optionally filter out paths not refering to the store.
params=("$@")
if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE" \
-a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \); then
rest=()
n=0
while test $n -lt ${#params[*]}; do
p=${params[n]}
p2=${params[$((n+1))]}
if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
skip $p
elif test "$p" = "-L" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "$p" = "-rpath" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "$p" = "-dynamic-linker" && badPath "$p2"; then
n=$((n + 1)); skip $p2
elif test "${p:0:1}" = "/" && badPath "$p"; then
# We cannot skip this; barf.
echo "impure path \`$p' used in link" >&2
exit 1
else
rest=("${rest[@]}" "$p")
fi
n=$((n + 1))
done
params=("${rest[@]}")
fi
extra=()
extraBefore=()
if test -z "$NIX_LDFLAGS_SET"; then
extra=(${extra[@]} $NIX_LDFLAGS)
extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
fi
# Add all used dynamic libraries to the rpath.
if test "$NIX_DONT_SET_RPATH" != "1"; then
# First, find all -L... switches.
allParams=("${params[@]}" ${extra[@]})
libPath=""
addToLibPath() {
local path="$1"
if test "${path:0:1}" != "/"; then return 0; fi
case "$path" in
*..*|*./*|*/.*|*//*)
local path2
if path2=$(readlink -f "$path"); then
path="$path2"
fi
;;
esac
case $libPath in
*\ $path\ *) return 0 ;;
esac
libPath="$libPath $path "
}
n=0
while test $n -lt ${#allParams[*]}; do
p=${allParams[n]}
p2=${allParams[$((n+1))]}
if test "${p:0:3}" = "-L/"; then
addToLibPath ${p:2}
elif test "$p" = "-L"; then
addToLibPath ${p2}
n=$((n + 1))
fi
n=$((n + 1))
done
# Second, for each -l... switch, find the directory containing the
# library and add it to the rpath.
rpath=""
addToRPath() {
# If the path is not in the store, don't add it to the rpath.
# This typically happens for libraries in /tmp that are later
# copied to $out/lib. If not, we're screwed.
if test "${1:0:${#NIX_STORE}}" != "$NIX_STORE"; then return 0; fi
case $rpath in
*\ $1\ *) return 0 ;;
esac
rpath="$rpath $1 "
}
findLib() {
for i in $libPath; do
if test -f $i/lib$1.so; then
addToRPath $i
fi
done
}
n=0
while test $n -lt ${#allParams[*]}; do
p=${allParams[n]}
p2=${allParams[$((n+1))]}
if test "${p:0:2}" = "-l"; then
findLib ${p:2}
elif test "$p" = "-l"; then
# I haven't seen `-l foo', but you never know...
findLib ${p2}
n=$((n + 1))
fi
n=$((n + 1))
done
# Finally, add `-rpath' switches.
for i in $rpath; do
extra=(${extra[@]} -rpath $i)
done
fi
# Optionally print debug info.
if test "$NIX_DEBUG" = "1"; then
echo "original flags to @ld@:" >&2
for i in "${params[@]}"; do
echo " $i" >&2
done
echo "extra flags to @ld@:" >&2
for i in ${extra[@]}; do
echo " $i" >&2
done
fi
if test -n "$NIX_LD_WRAPPER_EXEC_HOOK"; then
. "$NIX_LD_WRAPPER_EXEC_HOOK"
fi
exec @ld@ ${extraBefore[@]} "${params[@]}" ${extra[@]}

View File

@ -0,0 +1,25 @@
addCVars () {
if test -d $1/include; then
export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I$1/include"
fi
if test -d $1/lib; then
export NIX_LDFLAGS="$NIX_LDFLAGS -L$1/lib"
fi
}
envHooks=(${envHooks[@]} addCVars)
# Note: these come *after* $out in the PATH (see setup.sh).
if test -n "@gcc@"; then
PATH=$PATH:@gcc@/bin
fi
if test -n "@binutils@"; then
PATH=$PATH:@binutils@/bin
fi
if test -n "@glibc@"; then
PATH=$PATH:@glibc@/bin
fi

View File

@ -0,0 +1,23 @@
skip () {
if test "$NIX_DEBUG" = "1"; then
echo "skipping impure path $1" >&2
fi
}
# Checks whether a path is impure. E.g., `/lib/foo.so' is impure, but
# `/nix/store/.../lib/foo.so' isn't.
badPath() {
local p=$1
# Relative paths are okay (since they're presumably relative to
# the temporary build directory).
if test "${p:0:1}" != "/"; then return 1; fi
# Otherwise, the path should refer to the store or some temporary
# directory (including the build directory).
test \
"${p:0:${#NIX_STORE}}" != "$NIX_STORE" -a \
"${p:0:4}" != "/tmp" -a \
"${p:0:${#NIX_BUILD_TOP}}" != "$NIX_BUILD_TOP"
}